Results 271 to 280 of about 12,958,216 (304)

Infinite Classes of Covering Numbers

Canadian Mathematical Bulletin, 2000
AbstractLet D be a family of k-subsets (called blocks) of a v-set X(v). Then D is a (v, k, t) covering design or covering if every t-subset of X(v) is contained in at least one block of D. The number of blocks is the size of the covering, and the minimum size of the covering is called the covering number.
Bluskov, I., Greig, M., Heinrich, K.
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Class numbers of group extensions

Journal of Group Theory, 2010
Let \(X\) be a finite group and \(N\) a normal subgroup of \(X\). Let \(G=X/N\). A well-known formula due to Gallagher states that \(k(X)=\sum_{\theta\in\text{Irr}(N)}k_\theta(I_G(\theta))/|G:I_G(\theta)|\). Here \(k(X)\) denotes the number of conjugacy classes of \(X\), \(\text{Irr}(N)\) is the set of irreducible complex characters of \(N\), \(I_G ...
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On virtual classes and real numbers

Journal of Symbolic Logic, 1950
In a simple, applied functional calculus of first order (i.e., one admitting no functional variables but at least one functional constant), abstracts or schematic expressions may be introduced to play the role of variables over designatable sets or classes.
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On Dirichlet's Class Number Formula

Journal of the London Mathematical Society, 1978
This paper gives a new arithmetic proof of Dirichlet's formula for the number of distinct classes of integral primitive binary quadratic forms of a given negative discriminant. Comparing his proof with the arithmetic proof of \textit{B. A. Venkov} [Math. Z. 33, 350--374 (1931; Zbl 0001.12003; JFM 57.0194.02)], the author underlines: ``The main interest
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Class Group and Class Number

2022
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Class-group and class-number

1979
Ian Stewart, David Tall
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On the class overlap problem in imbalanced data classification

Knowledge-Based Systems, 2021
Andrei Petrovski, Eyad Elyan, Pattaramon Vuttipittayamongkol   +2 more
exaly  

A class of quadrinomial Garsia numbers

Integers, 2011
From the text: An algebraic integer is called a Garsia number if it is real and larger than one, if all conjugates have modulus larger than one and if its norm has modulus two. Examples of Garsia numbers are given in [\textit{A. M. Garsia}, Trans. Am. Math. Soc.
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Class-overlap undersampling based on Schur decomposition for Class-imbalance problems

Expert Systems With Applications, 2023
Qi Dai, Jian-Wei Liu
exaly  

Inhibition of the CtBP complex and FBXO11 enhances MHC class II expression and anti-cancer immune responses

Cancer Cell, 2022
Ali Motazedian
exaly